ci: fixes subsequent runs of promotion workflow (#3057)

Author: baywet

.github/workflows/promote-shipped-apis.yml

@@ -7,6 +7,10 @@ on:
       - support/v2
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+
 jobs:
   promote-apis:
     runs-on: ubuntu-latest